<template>
    <div class="search-container">
        <!-- 搜索栏 -->
        <!--
          Tips: 在 van-search 外层增加 form 标签，且 action 不为空，即可在 iOS 输入法中显示搜索按钮
         -->
        <form class="search-form" action="/">
            <van-search
                v-model="searchText"
                show-action
                placeholder="请输入搜索关键词"
                background="#3296fa"
                @search="onSearch"
                @cancel="onCancel"
                @focus="isResultShow = false"
            />
        </form>
        <!-- /搜索栏 -->

        <!-- 搜索结果 -->
        <search-result v-if="isResultShow"
        :search-text="searchText"/>
        <!-- /搜索结果 -->

        <!-- 联想建议 -->
        <search-suggestion v-else-if="searchText"
        :search-text="searchText"
        @search="onSearch"/>
        <!-- /联想建议 -->

        <!-- 历史记录 -->
        <search-history v-else
        :search-histories="searchHistories"
        @search="onSearch"
        @clear-search-histories="searchHistories = []"/>
        <!-- /历史记录 -->
    </div>
</template>

<script>
import SearchHistory from './components/search-history'
import SearchSuggestion from './components/search-suggestion'
import SearchResult from './components/search-result'
import { getItem, setItem } from '@/utils/storage'

export default {
  name: 'SearchIndex',
  components: {
    SearchHistory,
    SearchSuggestion,
    SearchResult
  },
  props: {},
  data () {
    return {
      searchText: '',
      isResultShow: false, // 控制搜索结果的展示
      searchHistories: getItem('TOUTIAO_SEARCH_HISTORIES') || [] // 搜索的历史记录数据
    }
  },
  computed: {},
  watch: {
    searchHistories (value) {
      setItem('TOUTIAO_SEARCH_HISTORIES', value)
    }
  },
  created () {},
  mounted () {},
  methods: {
    onSearch (val) {
      // 更新文本框内容
      this.searchText = val

      // 存储搜索历史记录
      // 要求：不要有重复历史记录、最新的排在最前面
      const index = this.searchHistories.indexOf(val)
      if (index !== -1) {
        this.searchHistories.splice(index, 1)
      }
      this.searchHistories.unshift(val)

      // 渲染搜索结果
      this.isResultShow = true
    },
    onCancel () {
      this.$router.back()
    }
  }
}
</script>

<style scoped lang="less">
.search-container {
    .van-search__action {
        color: #fff;
    }
}
</style>
